GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1998 🢒 Silhouette Ext. 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Auxiliary HVAC Module Replacement

Removal Procedure
  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  2. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  3. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    4. Object Number: 400659 Size: SH
  4. Remove the rear A/C line block fitting bolt.

    5. Important: Cap or tape the open A/C refrigerant lines immediately.

  5. Disconnect the A/C line block fitting, remove and discard the O-ring seals, and cap or tape the lines to prevent contamination of the system.

    6. Object Number: 400657 Size: SH
  6. Disconnect the heater hoses quick disconnects.
  7. Lower the vehicle.
  8. Remove the left side quarter trim. Refer to Rear Quarter Lower Trim Panel Replacement in Interior Trim.

    9. Object Number: 401095 Size: SH
  9. Disconnect the following items at the HVAC module:
    10. • The electrical connectors (1,2)
    • The vacuum line (3)
  10. Disconnect the rear compartment air outlet duct from the HVAC module.
  11. Remove the mounting bolts and the nut from the HVAC module.

    12. Object Number: 400655 Size: SH
  12. Remove the HVAC module.
  13. Remove and discard the HVAC module to body seals.